[Pkg-opencl-devel] Bug#913141: workaround Re: beignet: Segmentation fault while running opencv_perf_dnn

[Rebecca N. Palmer]

This appears to be a crash in a loop unrolling optimization pass 
(enabled only when -cl-fast-relaxed-math is set, hence only crashing then).

Disabling this pass unconditionally (see attached) avoids the crash, but 
may reduce performance.
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